Surveying instrument.



PATENTED AUG. 11, 1903.

J. HARMAN,

SURVEYING INSTRUMENT.

APPLIOATIOH FILED NOV. 19, 1901.

Z SHEETS-SHEET 1.

N0 MODEL.

Stream? I PATENTED AUG. 11, 1903.

J. HARMAN. SURVEYING INSTRUMENT.

APPLICATION FILED NOV. 19,1901.

2 sHEETs- SHEET 2.

N0 MODEL.

Qwuentoz wa 572 War/77077- 13 flrmm UNITED STATES;

- iatentedAugust 11, 1903.

PATENT OFFICE.

JOSEPH HARMAN, OF BRAINERD, MINNESOTA, ASSIGNOR OF ONE-HALF TO GEORGE w.Ho L n, 'oF R E D, MINNESOTA.

' SURVEYING INSTRU ENT;

SPECIFICATION forming part of Letters Patent No. 735,763, dae August 11,1903.

' Application filed November 19; 1901- Serlal No. 82,819. (Ila model.)

To all whom it may concern.-

Be it known that I, J OSEPH HARMAN, a citizen of the United States,residing at Brainerd, in the county of Crow Wing and State of Minnesota,have invented certain new and useful Improvements in SurveyingInstruments, of which the following is a specification, reference beinghad therein to the accompanying drawings.

My invention relates to new and useful improvements in surveyinginstruments, and more especially to a level for determining the positionas to horizontality of an object or surface to which it is applied. Itsprimary object is to employ an indicating-needle which is unaffected bymagnetism and which is controlled in its movement by a novel arrangementof weights. I

A further object is to so arrange theioperating-weights as to preventall pressure or strain upon the pivot of the needle.

With these and otherobjects in view the invention consists in the novelconstruction and combination of parts hereinafter more fully describedand claimed, and illustrated in the accompanying drawings, showing thepreferred form of my inventiomandinwhich- Figure 1 is a perspective viewof the device. Fig. 2 is a front elevation of the needle-operatingmechanism with the needleand dial removed; and Fig. 3 is a centralvertical section through said mechanism, showing theneedle connectedthereto.

Referring to the figures by numerals of ref erence, 1 is a circulargraduated table adjustably secured by means of screws 2 to the web 3 ofa tripod. Extending upward from the edge of a circular opening in thetable 1 is a collar 4, having a pair of lugs 5 at opposite sides thereofwhich form notches therebetween. These notches are adapted to receivearms 6, extending from opposite sides of a circular casing 7, wherebysaid casing is supported in the circular opening in the-table beforereferred to. Afsuitable ornamented bracket8 extends from each arm 6, andthese brackets, together with the casing 7, are secured to or formedwith a sight 9, having a longitudinally-extending groove 10 in its uppersurface. Each end of the groove 10 is closed byaplate 11, having anaperture therein in alinement with said groove, the aperture being shownat 12 in Fig. 1.

The collar 4 is revolubly secured in any suitable manner upon the table1 and is provided 5 5 with an indicatingfinger 13, as shown.

The casing 7 is provided in the inner surface of the back thereof with aconcentric groove 14, adapted to a receive cylindrical lug 15, extendingrearwardly from the center of a hollow roller 16, mounted upon the innerperiphery of the casing. The inner surface of the back of roller 16 isalso provided with a concentric groove 17, within which is fitted acylindrical lug 18, extending from the center of a second hollowroller19, which is mounted upon the inner periphery of the roller 16.

A suitable graduated dial 20 is secured within the casing 7 and abutsagainst an annular shoulder 21, formed within the casing. Revolublymounted in the center of the dial is a pin 22, to the outer end of whichis secured a needle 23, while its inner end is fas= tened to an arm 24,arranged within the roller 19. V This arm is provided with a slot 25,adapt- 7 5 ed to'receive a pin 26, extending from. the center of roller19.

. A glass cover27 is fitted within the casing 7 over the dial 20 andneedle 23 and is secured in position in any suitable manner, as by meansof a wire 28. A spacing-ring 29 is arranged; between the dial and glassand serves to hold said glass removed from the needle 23. M In operationthe level is adjusted by means of the screws 2 until the sight isbrought into proper position. The rollers 16 and 19 promptly roll to thelowest point in the easing 7, and the pin 26 moves the arm 24:therewith, thereby causing the needle 23 to indio cate the pitch of thelevel upon the dial 20.

By removing the casing from the collar at and inverting the same it canbe.. used as an ordinaryl-evel, the sight 9 servingais the base.

It will be understood that the lugs'15 and 18 hold the rollers 16 and 19always inc'ontact with the casing '7 and roller 16, respectively. Theparts will not,therefore,become displaced when the casing is suddenlyinverted.

The device is extremely simple in construc- I00 tion, durable, andefficient. The rollers freely move in their positions, and as there isno what I therefore claim as new, and desire to secure by LettersPatent, is-

1. The combination with a sight; of a casing, a dial-face thereto, aneedle pivotedin said face, and nesting weights within the casing andone of which is adapted to travel upon the inner periphery of saidcasing, one of said weights being connected to and adapted to operatethe needle.

2. The combination with a sight; of a casing, a dial-face thereto, aneedle pivoted to said face, nesting weights within the casing and oneof which is adapted to travel along the inner periphery of the casing,one of said weights being connected to and adapted to operate theneedle, and means for preventing radial movement of the weights withinthe casing.

3. The combination with a sight; of a casing secured thereto, adial-face to the casing, a needle pivoted to said face, a slotted arm tothe needle, a series of nesting weight-s within the casing and one ofthem adapted to travel upon the inner periphery of the casing, the innerone of the nesting weights being adapted to travel upon the innerperiphery of a larger weight,and a pin to said inner weight adapted toengage the arm and operate the needle.

4. The combination with a sight; of a casing secured thereto, adial-face to the casing, a needle pivoted to said face, a slotted arm tothe needle,a series of nesting weights within the casing and adapted totravel upon the inner periphery of the casing, the inner one of thenesting weights being adapted to travel upon the inner periphery of alarger weight,

a pin to said inner weight adapted to engage the arm and operate theneedle, and means for preventing radial movement of the weights.

5. The combination with a sight; of a circular casing, a groove thereinconcentric with the edge of the casing, a revoluble weight mounted uponthe inner periphery of the easing, a central lug upon the weight mountedin said concentric groove in the casing, a second revoluble weightmount-ed upon the inner periphery of the first-mentioned weight, acentral lug upon said weight mounted in a groove within, and concentricwith the edge of, said first-mentioned weight, a pin extending from saidsecond weight, a dial to the casin g, a needle pivoted in the dial, andan arm movable therewith and engaged by said pin.

6. The combination with a tripod having a graduated table adj ustablymounted thereon; of a revoluble collar upon the table, and a levelloosely mounted on said collar, said level comprising a sight, a casing,a dial-face to the casing, a needle pivoted in said face, a slotted armto the needle, a series of nesting weights within the casing and adaptedto travel upon the periphery of the casing, the

inner one of the nesting weights being adapted to travel upon the innerperiphery of a larger weight, a pin to said inner weight adapted toengage the arm and operate the needle, and means for preventing radialmovement of the weights.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH HARMAN.

Witnesses:

R. T. BROWN, 0. A. ALLBRIGHT.

